CN116648836A - Light source device - Google Patents

Light source device Download PDF

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Publication number
CN116648836A
CN116648836A CN202180088206.2A CN202180088206A CN116648836A CN 116648836 A CN116648836 A CN 116648836A CN 202180088206 A CN202180088206 A CN 202180088206A CN 116648836 A CN116648836 A CN 116648836A
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CN
China
Prior art keywords
light
optical path
shielding
light source
sensor
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Pending
Application number
CN202180088206.2A
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Chinese (zh)
Inventor
古田孝一郎
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Olympus Medical Systems Corp
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Olympus Medical Systems Corp
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Publication date
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Publication of CN116648836A publication Critical patent/CN116648836A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/16—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits
    • H01L25/167—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits comprising optoelectronic devices, e.g. LED, photodiodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
    • H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
    • H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
    • H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/068—Stabilisation of laser output parameters
    • H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • H05B45/22—Controlling the colour of the light using optical feedback
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
    • A61B1/0661—Endoscope light sources

Abstract

A light source device (10) is provided with: a first light source (15) and a second light source (14) that emit first light (L5) and second light (L4), respectively, the second light (L) having a spectrum different from that of the first light (L1); an optical path conversion element (24) that guides the first light (L5) and the second light (L4) to a common optical path (P), respectively; a first sensor (55) and a second sensor (54) that detect the amounts of light of the first light (L5) and the second light (L4), respectively; and a control unit (6) that controls the light amounts of the light sources (15, 14) based on the light amounts detected by the sensors (55, 54), wherein the light path conversion element (24) guides the first light (L5) to the common light path (P) by reflecting the first light (L5), and wherein the first sensor (55) is disposed on the common light path (P).

Description

Light source device
Technical Field
The present invention relates to a light source device.
Background
The light quantity of the light emitted from the light source in the light source device varies according to the influence of temperature variation or the like. The following light source devices are known: in order to make the light amount of the output light outputted from the light source device constant irrespective of the influence of temperature change or the like, the light amount of the light source is feedback-controlled (for example, refer to patent document 1).
The light source device of patent document 1 includes a white light source, a laser light source, a spectroscope that combines an optical path of the white light and an optical path of the laser light, a sensor that detects a light amount of the laser light, and a control unit that controls an amount of current input to the laser light source based on the light amount detected by the sensor.
Prior art literature
Patent literature
Patent document 1: japanese patent No. 4476036
Disclosure of Invention
Problems to be solved by the invention
In patent document 1, a beam splitter combines an optical path of laser light with an optical path of white light by reflecting a large part of the laser light, and a sensor detects the amount of the laser light transmitted through the beam splitter.
In the light emitted from the light source, not only a change in the amount of light but also a change in the spectrum such as a shift in the peak wavelength are generated due to an influence of a temperature change or the like. According to the change in the spectrum, the amount of light reflected by the spectroscope changes, and the amount of light detected by the sensor also changes. Therefore, in the case of the structure of patent document 1, the correlation between the light quantity of the laser light detected by the sensor and the light quantity of the output light output from the light source device to the outside varies with the spectral variation. As a result, the accuracy of adjusting the light quantity of the output light is lowered. In addition, when light of a plurality of colors emitted from a plurality of light sources forms output light, accuracy of adjusting the colors of the output light is lowered.
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a light source device capable of controlling the amount of light and the color of output light with high accuracy regardless of the spectral change of light emitted from a light source.
Means for solving the problems
In order to achieve the above object, the present invention provides the following technical solutions.
One embodiment of the present invention is a light source device including: a first light source that emits first light; a second light source that emits a second light having a spectrum different from that of the first light; an optical path conversion element that guides the first light and the second light to a common optical path, respectively; a first sensor that detects a light amount of the first light; a second sensor that detects a light amount of the second light; and a control unit that controls the light quantity of the first light source and the light quantity of the second light source based on the light quantity detected by the first sensor and the light quantity detected by the second sensor, wherein the optical path conversion element guides the first light to the common optical path by reflecting the first light, and the first sensor is disposed on the common optical path.
According to this aspect, the first light emitted from the first light source and the second light emitted from the second light source are guided to the common optical path by the optical path conversion element, respectively, and the first light and the second light traveling on the common optical path are output as output light from the outlet arranged on the common optical path or the extension line of the common optical path to the outside of the light source device.
The control device performs feedback control of the amounts of light emitted from the light sources based on the amounts of the first light detected by the first sensor and the second light detected by the second sensor.
In this case, the first sensor detects the light quantity of the first light reflected by the optical path conversion element. Therefore, the detected light amount of the first light is independent of the spectral change of the first light due to the influence of the temperature change or the like, and is equal to or close to the light amount of the first light included in the output light. Based on such detected light quantity, the light quantity and color of the output light can be controlled with high accuracy irrespective of the spectral change of the first light emitted from the light source.
In the above aspect, the light source device may further include: a limiting member disposed on the common optical path; a first collimating element disposed between the first light source and the limiting member, the first collimating element converting the first light into parallel light having a first diameter; and a second collimator element disposed between the second light source and the restriction member, the second collimator element converting the second light into parallel light having a second diameter, the restriction member having an opening portion for restricting passage of the first light and the second light only to the opening portion, the opening portion having a smaller diameter than the first diameter and the second diameter, the first sensor detecting a light amount of a portion of the first light that does not pass through the opening portion, and the second sensor detecting a light amount of a portion of the second light that does not pass through the opening portion.
According to this configuration, the light not serving as the output light among the light emitted from the light sources is detected by the sensor. This makes it possible to detect the light quantity of each light while preventing the light quantity of the output light from decreasing.
In the above aspect, the optical path conversion element may guide the second light to the common optical path by transmitting the second light, and the second sensor may be disposed on the common optical path.
According to this configuration, the second sensor detects the light amount of the second light transmitted through the optical path conversion element. Therefore, the detected light amount of the second light is independent of the spectral change of the second light due to the influence of the temperature change or the like, and is equal to or close to the light amount of the second light included in the output light. Based on the detected light amount, the light amount and the color of the output light can be controlled with higher accuracy regardless of the spectral change of the second light emitted from the light source.
In the above aspect, the light source device may further include: a first shielding member disposed between the first light source and the optical path conversion element, and shielding a first shielding region that is a partial region of the first light; and a second shielding member that is disposed between the second light source and the optical path conversion element and shields a second shielding region that is a partial region of the second light, the first sensor being disposed in the second shielding region, and the second sensor being disposed in the first shielding region.
According to this configuration, the first sensor is disposed in the second shielding region where the second light is not incident, and therefore the light amount of the first light can be detected more accurately. Therefore, the control section can control the light quantity of the first light source with higher accuracy. Further, since the second sensor is disposed in the first shielding region where the first light is not incident, the light amount of the second light can be detected more accurately. Therefore, the control section can control the light amount of the second light source with higher accuracy.
In the above aspect, the light source device may further include: a third light source that emits third light having a spectrum different from the spectrum of the first light and the spectrum of the second light; a third sensor arranged on the common optical path and configured to detect an amount of the third light; and a third shielding member that is disposed between the third light source and the optical path conversion element and shields a third shielding region that is a partial region of the third light, the optical path conversion element guides the third light to the common optical path by transmitting the third light, the first sensor is disposed in a region where all shielding regions other than the first shielding region overlap, the second sensor is disposed in a region where all shielding regions other than the second shielding region overlap, and the third sensor is disposed in a region where all shielding regions other than the third shielding region overlap.
According to this structure, the third light is output as the output light in addition to the first light and the second light. In this case, the first sensor is disposed in a region where the second light and the third light do not enter, the second sensor is disposed in a region where the first light and the third light do not enter, and the third sensor is disposed in a region where the first light and the second light do not enter. This allows the respective sensors to detect the light amounts of the respective lights more accurately.
In the above manner, the first collimating element and the second collimating element may be lenses, respectively.
The lens is compact and is capable of converting divergent light emitted from the light source into parallel light. Therefore, by using a lens as the collimator element, miniaturization of the light source device can be achieved.
In the above aspect, the first shielding member and the second shielding member may be annular members, respectively, and the first shielding member may include: an annular or partially annular shielding portion; and a passing portion provided in a part of a circumferential direction of the first shielding member, the passing portion passing the first light, the second shielding member including: an annular or partially annular shielding portion; and a passing portion provided in a part of the second shielding member in the circumferential direction, and passing the second light.
According to this configuration, the light flux passing through the inside of the annular or partially annular shielding member can be used as the output light, and the shielding region can be provided in a region not used as the radially outer side of the output light. In addition, by detecting light that does not pass through the passing portion and does not serve as output light by the sensor, it is possible to prevent a decrease in the light quantity of the output light and detect the light quantity of each light.
Effects of the invention
According to the present invention, the light quantity and color of the output light can be controlled with high accuracy regardless of the spectral change of the light emitted from the light source.
Drawings
Fig. 1 is an overall configuration diagram of a light source device according to a first embodiment.
Fig. 2 is a view of an aperture stop on a common optical path of the light source device of fig. 1 as viewed from an incident side.
Fig. 3 is a diagram illustrating a spectral change of light emitted from an LED of the light source device of fig. 1.
Fig. 4 is a diagram showing reflection characteristics of the optical path conversion element of the light source device of fig. 1.
Fig. 5 is an overall configuration diagram of the light source device of the second embodiment.
Fig. 6 is a view of a plurality of shielding members of the light source device of fig. 5 as seen from respective incident sides.
Fig. 7 is a view of an aperture stop and a sensor on a common optical path of the light source device of fig. 5 as viewed from an incident side.
Detailed Description
(first embodiment)
A light source device according to a first embodiment of the present invention will be described with reference to the accompanying drawings.
As shown in fig. 1, the light source device 10 according to the present embodiment combines a plurality of lights emitted from a plurality of light sources to generate output light L having a desired color and spectrum, and outputs the output light L from the output port 10a to the outside of the light source device 10. For example, the light source device 10 is connected to the endoscope 30, and the output light L is used as illumination light for illuminating the field of view of the endoscope 30.
In the present embodiment, the case where 5 light sources 11, 12, 13, 14, 15 are provided is described, but the number of light sources may be any number of 2 or more.
The light source device 10 includes: five light sources 11, 12, 13, 14, 15; light path conversion elements 21, 22, 23, 24 that guide light L1, L2, L3, L4, L5 emitted from the light sources 11, 12, 13, 14, 15, respectively, to the common light path P; an aperture stop (restriction member) 31 arranged on the common optical path P; five collimating elements 41, 42, 43, 44, 45 that convert light L1, L2, L3, L4, L5 into parallel light, respectively; five sensors 51, 52, 53, 54, 55 that detect the light amounts of the lights L1, L2, L3, L4, L5, respectively; and a control board (control unit) 6 for controlling the light sources 11, 12, 13, 14, 15.
The common optical path P is an optical path through which all of the 5 lights L1, L2, L3, L4, L5 pass, that is, an optical path through which the output light L passes, and an output port 10a is provided on the common optical path P or an extension line of the common optical path P. An arbitrary optical element such as a lens 40 for converting the output light L into converging light and a filter for cutting off light of a specific wavelength may be arranged in the common optical path P.
The light sources 11, 12, 13, 14, 15 are LED (light-emitting diode) light sources, and emit violet, blue, green, amber, and red light L1, L2, L3, L4, L5, respectively. Hereinafter, the light sources 11, 12, 13, 14, 15 are referred to as V-LEDs, B-LEDs, G-LEDs, A-LEDs, R-LEDs.
The optical path conversion elements 21, 22, 23, 24 are beam splitters, and transmit or reflect the incident light L1, L2, L3, L4, L5, so as to combine the optical paths P1, P2, P3, P4, P5 of the 5 light L1, L2, L3, L4, L5, and guide the light L1, L2, L3, L4, L5 to the common optical path P.
Specifically, the optical axes of the 4 LEDs 12, 13, 14, 15 are juxtaposed with each other, intersecting the optical axis a of the V-LED 11. The 4 LEDs 12, 13, 14, 15 are arranged in the order of wavelength, and the B-LED12 having a short wavelength is arranged on the side close to the V-LED 11.
The optical path conversion element 21 is disposed at a position where the optical axis a intersects the optical axis of the B-LED12, transmits the violet light L1 along the optical axis a, and reflects the blue light L2 along the optical axis a.
The optical path conversion element 22 is disposed at a position where the optical axis a intersects the optical axis of the G-LED13, and transmits the violet and blue light L1, L2 along the optical axis a, and reflects the green light L3 along the optical axis a.
The optical path conversion element 23 is disposed at a position where the optical axis a intersects the optical axis of the a-LED14, and transmits the violet, blue, and green light L1, L2, L3 along the optical axis a, and reflects the amber light L4 along the optical axis a.
The optical path conversion element 24 is disposed at a position where the optical axis a intersects the optical axis of the R-LED15, and transmits the violet, blue, green, and amber light L1, L2, L3, L4 along the optical axis a, and reflects the red light L5 along the optical axis a.
Thus, the common optical path P is an optical path between the optical path switching element 24 and the output port 10a.
As shown in fig. 2, the aperture stop 31 is an annular member, and includes an opening 3a arranged on the optical axis of the common optical path P and allowing the output light L to pass therethrough, and an annular shielding portion 3b surrounding the opening 3a and shielding the output light L. The aperture stop 31 restricts the passage of the output light L only to the opening 3a.
The collimator elements 41, 42, 43, 44, 45 are arranged between the corresponding light sources 11, 12, 13, 14, 15 and the aperture stop 31, respectively. The light L1, L2, L3, L4, L5 emitted from the LEDs 11, 12, 13, 14, 15 is divergent light. The collimator elements 41, 42, 43, 44, 45 convert the light L1, L2, L3, L4, L5 into parallel light having a diameter larger than that of the opening 3a, respectively. The diameters of the parallel light beams of the light beams L1, L2, L3, L4, and L5 may be the same or different from each other. Therefore, as shown in fig. 2, the light flux passing through the central portion of the opening 3a among the respective lights L1, L2, L3, L4, L5 forms output light, and the radially outer portion corresponding to the shielding portion 3b does not pass through the opening 3a and is not used as output light.
Specifically, the collimator element 41 is disposed in the optical path P1 between the V-LED11 and the optical path conversion element 21, and converts the violet light L1 into parallel light.
The collimator element 42 is disposed on the optical path P2 between the B-LED12 and the optical path conversion element 21, and converts the blue light L2 into parallel light.
The collimator element 43 is disposed in the optical path P3 between the G-LED13 and the optical path conversion element 22, and converts the green light L3 into parallel light.
The collimator element 44 is disposed in the optical path P4 between the a-LED14 and the optical path conversion element 23, and converts the amber light L4 into parallel light.
The collimator element 45 is disposed in the optical path P5 between the R-LED15 and the optical path conversion element 24, and converts the red light L5 into parallel light.
Each collimating element 41, 42, 43, 44, 45 is preferably a lens. The collimating elements 41, 42, 43, 44, 45 of fig. 1 are each constituted by a single convex lens. The lens is compact and is capable of converting divergent light into parallel light. Therefore, by using lenses as the collimator elements 41, 42, 43, 44, 45, miniaturization of the light source device 10 can be achieved.
The collimator elements 41, 42, 43, 44, 45 may be optical elements other than convex lenses, for example, tapered rods. The collimator elements 41, 42, 43, 44, 45 may be constituted by a combination of a plurality of optical elements.
The sensors 51, 52, 53, 54, 55 are arbitrary sensors capable of detecting the light quantity of light, and are photodiodes, for example. The sensors 51, 52, 53, 54, 55 detect the amounts of light L1, L2, L3, L4, L5 emitted from the corresponding light sources 11, 12, 13, 14, 15, respectively.
Here, the lights L2, L3, L4, L5 are reflected by the optical path conversion elements 21, 22, 23, 24, respectively. The sensors 52, 53, 54, 55 are disposed on the emission sides (the common optical path P side) of the optical path conversion elements 21, 22, 23, 24 that reflect the light L2, L3, L4, L5 to be detected, respectively, and detect the amounts of light of the reflected light L2, L3, L4, L5, respectively. Since the violet light L1 passes through all the optical path conversion elements 21, 22, 23, and 24, the sensor 51 is disposed at an arbitrary position between the V-LED11 and the output port 10a.
The sensors 51, 52, 53, 54, 55 are disposed at positions to detect the amounts of light of the portions of the lights L1, L2, L3, L4, L5 that do not pass through the opening 3a of the aperture stop 31, respectively. Specifically, the sensors 51, 52, 53, 54, 55 are disposed at positions corresponding to radially outer portions of the shielding portions 3b among the lights L1, L2, L3, L4, L5, respectively.
In fig. 1, four aperture stops 32, 33, 34, and 35 are provided in addition to the aperture stop 31. Each of the aperture stops 32, 33, 34, 35 has the same structure as the aperture stop 31, and has an opening 3a and a shielding 3b. The aperture stops 32, 33, 34, 35 are disposed on the incident side (V-LED 11 side) of the optical path conversion elements 21, 22, 23, 24, respectively. Thus, only the violet light L1 is incident on the shielding portion 3b of the aperture stop 32, only the blue light L2 is incident on the shielding portion 3b of the aperture stop 33, only the green light L3 is incident on the shielding portion 3b of the aperture stop 34, only the amber light L4 is incident on the shielding portion 3b of the aperture stop 35, and only the red light L1 is incident on the shielding portion 3b of the aperture stop 31.
The sensors 51, 52, 53, 54, 55 are disposed on the incidence side of the aperture stops 32, 33, 34, 35, 31, respectively, and only the light L1, L2, L3, L4, L5 to be detected is incident on the respective sensors 51, 52, 53, 54, 55. Therefore, as the sensors 51, 52, 53, 54, 55, sensors having sensitivity to a wide range of wavelengths can be used. The sensors 51, 52, 53, 54, 55 may be fixed to the incident side surfaces of the aperture stops 32, 33, 34, 35, 31, respectively.
In the case of using, as the sensors 51, 52, 53, 54, 55, sensors having sensitivity only to the wavelength regions of the light L1, L2, L3, L4, L5 to be detected, the aperture stops 32, 33, 34, 35 may be omitted, and the sensors 51, 52, 53, 54, 55 may be arranged at arbitrary positions where the radially outer portions of the light L1, L2, L3, L4, L5 to be detected are incident.
The control board 6 is connected to the LEDs 11, 12, 13, 14, 15 via the driving boards 71, 72, 73, 74, 75, and to the sensors 51, 52, 53, 54, 55 via the detection board 8. The control board 6 controls the light amounts of the LEDs 11, 12, 13, 14, 15 via the driving boards 71, 72, 73, 74, 75 based on the light amounts of the lights L1, L2, L3, L4, L5 detected by the sensors 51, 52, 53, 54, 55.
Specifically, information on the amounts of light (detected amounts of light) detected by the sensors 51, 52, 53, 54, 55 is input to the control substrate 6 via the detection substrate 8. The control board 6 stores target light amounts corresponding to the LEDs 11, 12, 13, 14, 15. The driving substrates 71, 72, 73, 74, 75 supply currents for causing the LEDs 11, 12, 13, 14, 15 to emit light to the LEDs 11, 12, 13, 14, 15, respectively. The control board 6 controls the amounts of current supplied to the LEDs 11, 12, 13, 14, 15 by the driving boards 71, 72, 73, 74, 75 based on the detected amounts of light, thereby performing feedback control on the amounts of light of the LEDs 11, 12, 13, 14, 15 so that the detected amounts of light coincide with the target amounts of light. Such control is realized by a control circuit formed on the control board 6, for example.
Next, the operation of the light source device 10 will be described.
According to the light source device 10 of the present embodiment, the light L1, L2, L3, L4, L5 emitted from the LEDs 11, 12, 13, 14, 15 is guided to one common optical path P by the optical path conversion elements 21, 22, 23, 24, and the output light L is formed in the common optical path P. The output light L traveling on the common optical path P is output from the output port 10a to the outside of the light source device 10.
Inside the light source device 10, the light amounts of the lights L1, L2, L3, L4, and L5 are detected by the sensors 51, 52, 53, 54, and 55, respectively, and the detected light amounts of the lights L1, L2, L3, L4, and L5 are transmitted to the control substrate 6 via the detection substrate 8. The control board 6 compares the detected light amounts of the respective lights L1, L2, L3, L4, and L5 with the corresponding target light amounts, and performs feedback control on the LEDs 11, 12, 13, 14, and 15 based on the differences between the detected light amounts and the target light amounts. Thus, the amounts of light L1, L2, L3, L4, and L5 included in the output light L are controlled to be predetermined target amounts of light, and the amounts, colors, and spectrums of the output light L are controlled to be predetermined amounts of light, colors, and spectrums.
In this case, as shown in fig. 3, spectral changes such as shifts in peak wavelengths may occur in the light L1, L2, L3, L4, L5 emitted from the LEDs 11, 12, 13, 14, 15 due to the influence of temperature changes or the like. Fig. 3 shows an example of a change in the emission spectrum of the R-LED15 when the room temperature is changed from 10 to 50 ℃ while a constant current is supplied to the R-LED 15. As the temperature becomes higher, the peak wavelength shifts to the long wavelength side, and the peak intensity decreases. As shown in fig. 4, the reflection characteristics of the optical path conversion elements 21, 22, 23, and 24 have wavelength dependence. Fig. 4 shows an example of reflection characteristics of the beam splitter when light is incident on the beam splitter as the optical path conversion element 24 in a range of 45 ° ± 10 °. For example, when the peak wavelength of the red light L5 incident on the spectroscope changes from 630nm to 640nm, the reflectance of the spectroscope to the light L5 greatly changes.
Accordingly, as the spectrum of the light L1, L2, L3, L4, L5 changes, the amounts of light L2, L3, L4, L5 reflected by the light path conversion elements 21, 22, 23, 24 also change. That is, as the spectrum changes, the correlation between the amounts of light L1, L2, L3, L4, L5 emitted from the LEDs 11, 12, 13, 14, 15 and the amounts of light L1, L2, L3, L4, L5 included in the output light L changes.
According to the present embodiment, the sensors 52, 53, 54, 55 are disposed on the emission sides of the light path conversion elements 21, 22, 23, 24, respectively, and detect the amounts of light L2, L3, L4, L5 reflected by the light path conversion elements 21, 22, 23, 24, respectively. Therefore, the detected light amounts closer to the light amounts of the lights L2, L3, L4, and L5 included in the output light L can be obtained. Based on the detected light amounts, the light amounts of the LEDs 11, 12, 13, 14, and 15 can be feedback-controlled with high accuracy, and the light amounts and colors of the output light L can be controlled to predetermined light amounts and colors with high accuracy. Therefore, when the output light L is used as illumination light for the endoscope 30, the visual field can be illuminated with illumination light having a constant brightness and color regardless of the influence of temperature change or the like.
Further, the sensors 51, 52, 53, 54, 55 detect the light quantity of the portion of the light L1, L2, L3, L4, L5 emitted from the corresponding LEDs 11, 12, 13, 14, 15 that does not pass through the aperture stop 31 and is not used as the output light L. This can prevent the decrease in the light quantity of the output light L, and can detect the light quantity of each of the lights L1, L2, L3, L4, and L5.
In the present embodiment, the LEDs 11, 12, 13, 14, 15 are arranged so as to be farther from the common optical path P as the wavelength becomes shorter, but the arrangement of the LEDs 11, 12, 13, 14, 15 is not limited to this, and the LEDs 11, 12, 13, 14, 15 may be arranged in any order.
The magnitude of the spectral change varies for each of the lights L1, L2, L3, L4, L5. The optical path conversion elements 21, 22, 23, and 24 have the same transmission characteristics as the reflection characteristics, and have wavelength dependence. Therefore, in order to reduce the number of times that light having a large spectral variation passes through the optical path conversion element, it is preferable that the LED that emits light having a large spectral variation is disposed closer to the common optical path P. For example, the configuration of fig. 1 is effective when the shift in peak wavelength of the amber and red light L4, L5 is larger than the shift in peak wavelength of the violet, blue and green light L1, L2, L3.
(second embodiment)
Next, a light source device according to a second embodiment of the present invention will be described with reference to the drawings.
As shown in fig. 5, the light source device 20 of the present embodiment is different from the light source device 10 of the first embodiment in that shielding members 91, 92, 93, 94, 95 are provided in place of the aperture stops 32, 33, 34, 35, and all the sensors 51, 52, 53, 54, 55 are arranged on a common optical path P. In fig. 5, only the sensors 53, 55 of the five sensors 51, 52, 53, 54, 55 are illustrated. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
The light source device 20 includes LEDs 11, 12, 13, 14, 15, optical path conversion elements 21, 22, 23, 24, an aperture stop 31, collimator elements 41, 42, 43, 44, 45, sensors 51, 52, 53, 54, 55, a control board 6, and five shielding members 91, 92, 93, 94, 95.
Fig. 6 is a view of the shielding members 91, 92, 93, 94, 95 from the respective incident sides (the LEDs 11, 12, 13, 14, 15 sides). As shown in fig. 6, each of the shielding members 91, 92, 93, 94, 95 is a partially annular (C-shaped) flat plate member with a part cut away in the circumferential direction, and includes a partially annular shielding portion 9a for shielding the light L1, L2, L3, L4, L5 and a passing portion 9b which is formed by the cut away portion and passes the light L1, L2, L3, L4, L5. The passing portion 9b having an arbitrary shape may be provided at a part of the circumferential direction of the complete annular shielding portion 9 a.
The shielding members 91, 92, 93, 94, 95 are disposed on the light paths P1, P2, P3, P4, P5 on the emission sides of the collimator elements 41, 42, 43, 44, 45, respectively. The inner diameter of the shielding portion 9a is smaller than the diameter of the parallel light of the lights L1, L2, L3, L4, L5. Therefore, some of the light L1, L2, L3, L4, L5 incident on the shielding members 91, 92, 93, 94, 95 passes through the inner side of the shielding portion 9a and the passing portion 9b, and the other is shielded by the shielding portion 9 a. In fig. 6, the cross-hatched areas represent the shielded areas S1, S2, S3, S4, S5 shielded by the shielding portion 9 a.
As shown in fig. 6, the passing portions 9b of all the shielding members 91, 92, 93, 94, 95 are arranged at mutually different positions in the circumferential direction. When the shielding members 91, 92, 93, 94, 95 are overlapped with each other in the direction along the optical axis, all other shielding portions 9a of the shielding members 91, 92, 93, 94, 95 are overlapped with one another in the passing portion 9b of the shielding members 91, 92, 93, 94, 95. As a result, as shown in fig. 7, regions T1, T2, T3, T4, and T5 in which all the shielding regions other than one shielding region overlap are formed in the common optical path P. For example, the region T1 is a region where 4 shielding regions S2, S3, S4, S5 other than the shielding region S1 overlap. That is, each of the areas T1, T2, T3, T4, T5 is an area where only 1 light L1, L2, L3, L4, or L5 is irradiated.
The sensors 51, 52, 53, 54, 55 are disposed in the areas T1, T2, T3, T4, T5, respectively. For example, the sensors 51, 52, 53, 54, 55 are fixed to the surface of the aperture stop 31 on the incident side. Therefore, the light amounts of the respective lights L1, L2, L3, L4, L5 can be accurately detected using the sensors 51, 52, 53, 54, 55 having sensitivity to a wide range of wavelengths.
Next, the operation of the light source device 20 will be described.
According to the light source device 20 of the present embodiment, the light L1, L2, L3, L4, L5 emitted from the LEDs 11, 12, 13, 14, 15 forms the output light L in the common optical path P, and the output light L is output from the output port 10a to the outside of the light source device 10, as in the light source device 10. In the light source device 20, the light amounts of the lights L1, L2, L3, L4, and L5 are detected by the sensors 51, 52, 53, 54, and 55, respectively, similarly to the light source device 10, and the control board 6 feedback-controls the LEDs 11, 12, 13, 14, and 15 based on the differences between the detected light amounts of the lights L1, L2, L3, L4, and L5 and the target light amounts. Thus, the amounts of light L1, L2, L3, L4, and L5 included in the output light L are controlled to be predetermined target amounts of light, and the amounts, colors, and spectrums of the output light L are controlled to be predetermined amounts of light, colors, and spectrums.
In this case, as described above, the transmission characteristics of the optical path conversion elements 21, 22, 23, 24 have wavelength dependence. Accordingly, as the spectrum of the light L1, L2, L3, L4, L5 changes, the light amounts of the light L1, L2, L3, L4 transmitted through the light path conversion elements 21, 22, 23, 24 also change. That is, as the spectrum changes, the correlation between the amounts of light L1, L2, L3, L4, L5 emitted from the LEDs 11, 12, 13, 14, 15 and the amounts of light L1, L2, L3, L4, L5 included in the output light L changes.
According to the present embodiment, the sensors 51, 52, 53, 54, 55 are disposed on the common optical path P at the subsequent stage from all the optical path conversion elements 21, 22, 23, 24, and detect the amounts of light L1, L2, L3, L4, L5 reflected by the optical path conversion elements 21, 22, 23, 24 and transmitted through the optical path conversion elements 21, 22, 23, 24, respectively. Therefore, compared with the first embodiment, the detected light amounts closer to the light amounts of the lights L1, L2, L3, L4, and L5 included in the output light L can be obtained. Based on the detected light amounts, the light amounts of the LEDs 11, 12, 13, 14, and 15 can be feedback-controlled with higher accuracy, and the light amounts and colors of the output light L can be controlled to predetermined light amounts and colors with higher accuracy. Therefore, when the output light L is used as illumination light for the endoscope 30, the visual field can be illuminated with illumination light having more constant brightness and color regardless of the influence of temperature change or the like.
Further, the sensors 51, 52, 53, 54, 55 detect the light quantity of the portion of the light L1, L2, L3, L4, L5 emitted from the corresponding LEDs 11, 12, 13, 14, 15 that does not pass through the aperture stop 31 and is not used as the output light L. This can prevent the decrease in the light quantity of the output light L, and can detect the light quantity of each of the lights L1, L2, L3, L4, and L5.
In the present embodiment, when sensors having sensitivity only to the wavelength regions of the light L1, L2, L3, L4, L5 to be detected are used as the sensors 51, 52, 53, 54, 55, the shielding members 91, 92, 93, 94, 95 may be omitted. In this case, the sensors 51, 52, 53, 54, 55 may be disposed at any position on the common optical path P where the light L1, L2, L3, L4, L5 to be detected is incident on the radially outer portion.
In the first and second embodiments, the plurality of light sources are LED light sources that emit monochromatic light, but the plurality of light sources may be any type of light sources as long as the plurality of light sources output light having different spectrums. For example, the plurality of light sources may include a lamp light source, and may also include a laser light source.
Description of the reference numerals
10. 20 light source device
11. 12, 13 light source, LED (third light source)
14 light source, LED (second light source)
15 light source, LED (first light source)
21. 22, 23, 24 optical path conversion element
31 aperture stop (limiting component)
3a opening part
3b shielding part
32. 33, 34, 35 aperture stops
41. 42, 43 collimation element (third collimation element)
44 collimation element (second collimation element)
45 collimation element (first collimation element)
51. 52, 53 sensor (third sensor)
54 sensor (second sensor)
55 sensor (first sensor)
6 control substrate (control part)
71. 72, 73, 74, 75 drive substrates
8 detection substrate
91. 92, 93 shielding parts (third shielding part)
94 shield (second shade)
95 shielding component (first shading component)
9a shielding part
9b passage portion
30 endoscope
Aaxis A
L1, L2, L3 light (third light)
L4 light (second light)
L5 light (first light)
P public light path
S1, S2, S3 mask region (third mask region)
S4 shielding region (second shielding region)
S5 shielding region (first shielding region)

Claims (7)

1. A light source device, comprising:
a first light source that emits first light;
a second light source that emits a second light having a spectrum different from that of the first light;
an optical path conversion element that guides the first light and the second light to a common optical path, respectively;
a first sensor that detects a light amount of the first light;
a second sensor that detects a light amount of the second light; and
a control unit that controls the light quantity of the first light source and the light quantity of the second light source based on the light quantity detected by the first sensor and the light quantity detected by the second sensor,
the optical path conversion element guides the first light to the common optical path by reflecting the first light,
the first sensor is disposed on the common optical path.
2. The light source device according to claim 1, wherein,
the light source device further includes:
a limiting member disposed on the common optical path;
a first collimating element disposed between the first light source and the limiting member, the first collimating element converting the first light into parallel light having a first diameter; and
a second collimating element disposed between the second light source and the limiting member, for converting the second light into parallel light having a second diameter,
the restricting member has an opening portion for restricting the passage of the first light and the second light only to the opening portion, the opening portion having a diameter smaller than the first diameter and the second diameter,
the first sensor detects the amount of light of a portion of the first light that does not pass through the opening,
the second sensor detects the amount of light of a portion of the second light that does not pass through the opening.
3. The light source device according to claim 1, wherein,
the optical path conversion element guides the second light to the common optical path by transmitting the second light,
the second sensor is disposed on the common optical path.
4. The light source device according to claim 1, wherein,
the light source device further includes:
a first shielding member disposed between the first light source and the optical path conversion element, and shielding a first shielding region that is a partial region of the first light; and
a second shielding member disposed between the second light source and the optical path conversion element, for shielding a second shielding region that is a partial region of the second light,
the first sensor is disposed in the second shielded region,
the second sensor is disposed in the first shielding region.
5. The light source device according to claim 3, wherein,
the light source device further includes:
a third light source that emits third light having a spectrum different from the spectrum of the first light and the spectrum of the second light;
a third sensor arranged on the common optical path and configured to detect an amount of the third light; and
a third shielding member disposed between the third light source and the optical path conversion element, for shielding a third shielding region that is a partial region of the third light,
the optical path conversion element guides the third light to the common optical path by transmitting the third light,
the first sensor is disposed in a region where all of the shielding regions other than the first shielding region overlap,
the second sensor is disposed in a region where all of the shielding regions other than the second shielding region overlap,
the third sensor is disposed in a region where all the shielding regions other than the third shielding region overlap.
6. The light source device according to claim 2, wherein,
the first collimating element and the second collimating element are lenses, respectively.
7. The light source device according to claim 4, wherein,
the first shielding member and the second shielding member are ring-shaped members respectively,
the first shielding member has: an annular or partially annular shielding portion; and a passing portion provided in a part of a circumferential direction of the first shielding member, for passing the first light,
the second shielding member has: an annular or partially annular shielding portion; and a passing portion provided in a part of the second shielding member in the circumferential direction, and passing the second light.
CN202180088206.2A 2021-03-05 2021-03-05 Light source device Pending CN116648836A (en)

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JPH11258523A (en) * 1998-03-13 1999-09-24 Fuji Photo Optical Co Ltd Light source device for endoscope
JP2006006803A (en) * 2004-06-29 2006-01-12 Pentax Corp Diaphragm controlling mechanism of electronic endoscope
JP5623266B2 (en) * 2010-12-17 2014-11-12 富士フイルム株式会社 Endoscope light source device and endoscope system
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